Scaffolding and black netting shrouds nearly all of 685 Fifth Avenue in preparation for a 100,000-square-foot office-to-condominium conversion. The project will also add ten floors atop the existing 20-story structure, which sits at the corner of Fifth Avenue and 53rd Street. Developed by Michael Shvo’s SHVO in partnership with BLG Holdings and Deutsche Financial, the finished building will stand 350 feet tall and contain 69 condominiums managed by Mandarin Oriental Hotel Group. Marin is the architect of record and designer for the $135 million project with March & White handling the interior designs. Brookfield Properties is in charge of marketing the Fifth Avenue retail space, which is still home to the Coach, Stuart Weitzman, and Tag Heuer flagship stores.